👍 Pilot - Got It

Okay — if you’re doing the thermostat replacement, the big things to remember are:

• ❄️ Start only with a fully cold engine.
• 🔧 The thermostat is at the engine end of the lower radiator hose.
• 🧼 Clean the sealing surface gently before installing the new thermostat seal.
• ⬆️ If the thermostat has a small jiggle valve, install it facing upward.
• 💧 Refill with Honda Type 2-compatible coolant and bleed air from the system.
• 🌡️ After repair, watch the temperature gauge and check for leaks after the first drive.

Beginner tip: take photos before removing hoses or bolts.

🔧 Water Pump - Replacement

Replacing the water pump on your Pilot means removing the timing belt covers, timing belt, and related front-engine components because the water pump is driven by the timing belt. This is a major engine service, and it is strongly recommended to replace the timing belt, hydraulic tensioner, idler pulley, and tensioner pulley at the same time.

Difficulty Level: Advanced | Estimated Time: 5-8 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before opening the cooling system.
• ⚠️ Disconnect the negative battery cable because you will be working near the starter wiring area and engine accessories.
• ⚠️ Support the engine before removing the right-side engine mount.
• ⚠️ Do not rotate the crankshaft or camshafts with the timing belt removed. Engine damage can occur.
• ⚠️ Keep coolant away from pets and children. It is poisonous.
• ⚠️ Use jack stands. Never rely on a floor jack alone.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 14mm socket
• 17mm socket
• 19mm socket
• 22mm socket
• 3/8-inch drive ratchet
• 1/2-inch drive breaker bar
• 1/2-inch drive torque wrench
• 3/8-inch drive torque wrench
• Honda crankshaft pulley holding tool 50mm (specialty)
• Crankshaft pulley bolt socket 19mm high-mass (specialty)
• Serpentine belt tool 14mm
• Flat-blade screwdriver
• Phillips screwdriver
• Trim clip removal tool
• Pliers
• Hose clamp pliers
• Drain pan 2-gallon minimum
• Plastic scraper
• Funnel
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Engine support jack with wood block
• Paint marker
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Water pump with gasket - Qty: 1
• Timing belt - Qty: 1
• Hydraulic timing belt tensioner - Qty: 1
• Timing belt tensioner pulley - Qty: 1
• Timing belt idler pulley - Qty: 1
• Serpentine drive belt - Qty: 1
• Honda Type 2-compatible coolant - Qty: 2 gallons
• Crankshaft pulley bolt - Qty: 1
• Right engine mount bolts - Qty: 1 set

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📋 Before You Begin

• 🅿️ Park your Pilot on level ground and set the parking brake.
• ❄️ Wait until the engine is fully cold before draining coolant.
• 🔋 Use a 10mm socket to disconnect the negative battery cable.
• 🛞 Raise the front passenger side with a floor jack and support it with jack stands.
• 🧠 A timing belt keeps the crankshaft and camshafts synchronized. If it is installed wrong, the engine can be damaged.
• 🧰 A torque wrench tightens bolts to an exact specification. This prevents loose bolts or stripped threads.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the Coolant

• Put on safety glasses and nitrile gloves.
• Place a 2-gallon drain pan under the radiator drain area.
• Use pliers if needed to open the radiator drain plug slowly.
• Remove the radiator cap by hand only after the engine is cold.
• Let the coolant drain fully, then close the drain plug gently.

Step 2: Remove the Passenger Front Wheel and Splash Shield

• Use a 19mm socket to loosen the passenger front wheel lug nuts.
• Raise the vehicle with a 3-ton floor jack and support it with 3-ton jack stands.
• Use a 19mm socket to remove the lug nuts and wheel.
• Use a trim clip removal tool and Phillips screwdriver to remove the inner splash shield clips and screws.

Step 3: Remove the Serpentine Belt

• Use a 14mm serpentine belt tool on the belt tensioner.
• Rotate the tensioner to release belt tension.
• Slide the belt off the pulleys by hand.
• Take a belt routing photo first.

Step 4: Support the Engine

• Place a floor jack with a wood block under the engine oil pan.
• Lift only until the wood block lightly supports the engine.
• Do not crush or dent the oil pan.

Step 5: Remove the Right Engine Mount

• Use 14mm and 17mm sockets to remove the right-side engine mount fasteners.
• Remove the mount from the engine bay.
• Keep bolts organized by location.
• During installation, torque typical right mount fasteners to Torque to 54 Nm (40 ft-lbs) unless your replacement hardware specifies otherwise.

Step 6: Remove the Crankshaft Pulley Bolt

• Install the Honda 50mm crankshaft pulley holding tool onto the crankshaft pulley.
• Use a 19mm high-mass crankshaft pulley bolt socket with a 1/2-inch breaker bar.
• Loosen and remove the crankshaft pulley bolt.
• Slide the crankshaft pulley off by hand.
• This bolt is extremely tight.

Step 7: Remove the Timing Belt Covers

• Use a 10mm socket to remove the upper and lower timing belt cover bolts.
• Remove the covers carefully.
• Inspect for oil or coolant contamination inside the covers.

Step 8: Set Engine to Top Dead Center

• Use a 19mm socket on the crankshaft bolt area to rotate the engine clockwise only.
• Line up the crankshaft timing mark with its pointer.
• Line up both camshaft pulley marks with their timing reference marks.
• Use a paint marker to mark the belt-to-pulley positions before removal.
• Top Dead Center means cylinder #1 is positioned at the correct timing reference point.

Step 9: Remove the Timing Belt Tension

• Use a 12mm socket to remove the hydraulic tensioner bolts.
• Remove the hydraulic tensioner from the engine.
• Use a 14mm socket to loosen the tensioner pulley bolt if needed.
• Slide the timing belt off the pulleys by hand.
• Do not turn the camshaft pulleys after the belt is removed.

Step 10: Remove the Old Water Pump

• Place the drain pan under the water pump area.
• Use a 10mm socket to remove the water pump bolts.
• Pull the water pump straight off the engine.
• Use a plastic scraper to clean the sealing surface.
• Do not gouge the aluminum engine surface.

Step 11: Install the New Water Pump

• Install the new water pump gasket onto the new pump.
• Place the water pump against the engine by hand.
• Use a 10mm socket to install the bolts finger-tight first.
• Tighten the bolts evenly in a crisscross pattern.
• Torque the water pump bolts to Torque to 12 Nm (9 ft-lbs).

Step 12: Install New Timing Components

• Use a 14mm socket to install the new idler pulley and tensioner pulley.
• Torque timing pulley bolts to Torque to 44 Nm (33 ft-lbs).
• Install the new timing belt, keeping the timing marks aligned.
• Route the belt tightly on the non-tensioned side first.
• Install the new hydraulic tensioner with a 12mm socket.
• Torque hydraulic tensioner bolts to Torque to 22 Nm (16 ft-lbs).

Step 13: Release the Hydraulic Tensioner

• Double-check all camshaft and crankshaft timing marks.
• Pull the retaining pin from the hydraulic tensioner by hand or with pliers.
• Wait a few minutes for the tensioner to apply belt tension.

Step 14: Verify Timing by Hand

• Use a 19mm socket and breaker bar to rotate the crankshaft clockwise two full turns.
• Stop at Top Dead Center again.
• Confirm the crankshaft and both camshaft timing marks still line up exactly.
• If the marks do not line up, remove the belt and correct timing before continuing.

Step 15: Reinstall Timing Covers and Crankshaft Pulley

• Use a 10mm socket to reinstall the timing belt covers.
• Slide the crankshaft pulley onto the crankshaft by hand.
• Install a new crankshaft pulley bolt.
• Use the Honda 50mm holding tool and 19mm high-mass socket to tighten the bolt.
• Torque the crankshaft pulley bolt to Torque to 245 Nm (181 ft-lbs).

Step 16: Reinstall the Engine Mount

• Use the floor jack with wood block to align the engine mount holes.
• Install the right engine mount and bolts by hand first.
• Use 14mm and 17mm sockets to tighten the fasteners.
• Torque typical right mount fasteners to Torque to 54 Nm (40 ft-lbs).

Step 17: Install the Serpentine Belt

• Route the new serpentine belt over the pulleys using your photo as a guide.
• Use the 14mm serpentine belt tool to rotate the tensioner.
• Slide the belt over the final pulley by hand.
• Release the tensioner slowly.
• Check that the belt ribs sit fully in every pulley groove.

Step 18: Reinstall Splash Shield and Wheel

• Use the trim clip removal tool and Phillips screwdriver to reinstall the splash shield clips and screws.
• Install the passenger front wheel by hand.
• Use a 19mm socket to snug the lug nuts.
• Lower the vehicle with the floor jack.
• Torque the wheel lug nuts to Torque to 127 Nm (94 ft-lbs).

Step 19: Refill the Cooling System

• Use a funnel to fill the radiator with Honda Type 2-compatible coolant.
• Fill the coolant reservoir to the MAX line.
• Reconnect the negative battery cable with a 10mm socket.
• Start the engine and set the cabin heat to HOT with the fan on low.
• Let the engine warm up while watching the temperature gauge.
• Add coolant as air bubbles come out and the level drops.

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✅ After Repair

• ✅ Check around the water pump and radiator hoses for leaks.
• ✅ Confirm the heater blows warm air after the engine warms up.
• ✅ Make sure the temperature gauge stays normal during idle and a short road test.
• ✅ After the first full heat cycle, let the engine cool and recheck coolant level.
• ✅ Recheck the passenger front lug nut torque after a short drive.
• ✅ If the engine runs rough, makes abnormal belt noise, or the timing marks were uncertain, do not drive it.

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💰 DIY vs Shop Cost

Shop Cost: $1,100-$1,800 (parts + labor)

DIY Cost: $300-$650 (parts only)

You Save: $800-$1,150 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 5-7 hours.

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🎯 Ready to get started?

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